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Two identical rings P and Q of radius 0.1 m are mounted co-axially at a distance 0.5 m apart. The charges of two rings are $2 μC$ and $4 μC$ respectively. The work done in transferring a charges of $5 μC$ from the centre of P to that of Q is

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1.28 J

0.0032 J

0.144 J

2.24 J

answer is B.

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Detailed Solution

w = $∆ v q = 18 \times 10^{- 2} - 17.68 \times 10^{- 2} = 0.32 \times 10^{- 2} j o u l e$

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